JPH0624809B2 - Laminate - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a thermosetting resin laminate having excellent surface characteristics.

(Prior Art) Thermosetting resin laminates, especially diallyl phthalate resin laminates, are known to have excellent moldability and post-form processability as well as physical and chemical properties. Above all, veneer is popular as a material with a calm texture. However, the diallyl phthalate resin laminated board is inferior to the melamine resin laminated board in terms of hardness and heat resistance such as cigarette resistance, and there is a difficulty in using it particularly for a top board typified by desks, counters and the like.

(Object of the Invention) An object of the present invention is to provide a thermosetting resin laminate using a diallyl phthalate resin or a mixed resin of the resin and an unsaturated polyester resin, which does not have the above-mentioned drawbacks and has improved surface characteristics. And

(Structure of the Invention) The present invention comprises a surface layer obtained by impregnating a substrate for impregnation selected from a printing paper, a woven fabric and a non-woven fabric with the following thermosetting resin composition and cured, and plywood, particle board and resin. It is a laminated plate in which a cured kraft paper and a substrate selected from metal plates are laminated and integrated.

The thermosetting resin composition is a diallyl phthalate resin or 100 parts by weight of a mixed resin of at least 20% by weight of a diallyl phthalate resin and an unsaturated polyester resin, three acryloyl groups or methacryloyl groups in the molecule. Pentaerythritol polyacrylate or polymethacrylate having the above or a mixture thereof 5
A thermosetting resin composition containing 70 parts by weight and a curing agent for the above resin.

The diallyl phthalate resin in the present invention refers to a diallyl phthalate prepolymer such as an already known ortho, iso or tere-diallyl phthalate prepolymer alone or a mixture thereof or a modified prepolymer thereof. As the unsaturated polyester resin, a generally known liquid one or solid one at room temperature is used. When the unsaturated polyester resin is used as the mixed resin, at least 20% by weight of the diallyl phthalate resin in the resin is required in order to obtain a laminated board that takes advantage of the characteristics of the diallyl phthalate resin.

The polyacrylate or polymethacrylate of pentaerythritol used in the present invention (hereinafter, both are collectively referred to as poly (meth) acrylate) includes an acryloyl group or a methacryloyl group (hereinafter both are collectively referred to as (meth)). Poly (meth) acrylates having three or more acryloyl groups) are used alone or as a mixture. A poly or mono (meth) acrylate having 2 or less (meth) acryloyl groups has insufficient compatibility with a diallyl phthalate resin or an unsaturated polyester resin, and the desired effect cannot be obtained.

The poly (meth) acrylate used in the present invention is four types of pentaerythritol monohydroxytriacrylate, pentaerythritol tetraacrylate, pentaerythritol monohydroxytrimethacrylate, and pentaerythritol tetramethacrylate, and these may be used alone or in a mixture. Used as. The compounding amount is appropriately in the range of 5 to 70 parts by weight, or 10 to 50 parts by weight with respect to 100 parts by weight of the mixed resin of diallyl phthalate resin or unsaturated polyester resin and diallyl phthalate resin. If the amount is less than 5 parts by weight, the effect of improving the surface properties, which is the object of the present invention, cannot be sufficiently obtained. If the amount is more than 70 parts by weight, the cured product becomes too hard and becomes brittle, and the resin becomes sticky during processing to improve workability. This will cause problems.

A commonly known curing agent for diallyl phthalate resin or unsaturated polyester resin is added to the composition of the present invention. Further, if necessary, other kinds of reactive monomers and additives usually used in the technical field such as an internal mold release agent, a filler, a flame retardant, a polymerization inhibitor, a pigment and the like can be added.

To produce a laminate using the composition of the present invention, a resin solution is prepared by dissolving the composition in an appropriate solvent, for example, an organic solvent such as acetone, toluene, methyl ethyl ketone, etc. It is achieved by impregnating a suitable amount of the resin and drying it, and then laminating and heat-molding it with plywood, particle board, or ordinary resin-impregnated kraft paper as the core. Further, the base material impregnated with the composition of the present invention may be heat-cured and then laminated on a metal plate such as an aluminum plate using an adhesive.

As the base material for impregnation, printing paper, woven cloth and non-woven cloth are selected. The heat molding conditions may be those of conventionally known allyl phthalate resin or unsaturated polyester resin,
Usually, 100 to 160 ° C., 1 to 60 kg / cm ² , and 1 to 60 minutes are sufficient.

(Effects of the Invention) A laminated board using the composition containing the poly (meth) acrylate of pentaerythritol of the present invention is a laminated board using a conventional diallyl phthalate resin or unsaturated polyester resin not containing the poly (meth) acrylate. Surface properties such as scratch hardness and cigarette resistance have been dramatically improved compared to the plate, and it has become possible to use it for the top plate which has been difficult to use in the past.

(Examples) Examples 1 to 4 Comparative Examples 1 to 3 Solid weight of the resin composition shown in Table 1 was 100 g / m 2.
The printing paper of No. ² was impregnated and dried to obtain an impregnated paper having a resin adhesion amount of 130 g / m ² .

Separately, prepare two sheets of kraft paper impregnated with a normal diallyl phthalate resin (total basis weight: 240 g / m ² , inner resin adhesion amount: 100 g / m ² ). It was pressed at 130 ° C. and 30 kg / cm ² using a mirror surface plate, and 20 minutes after insertion, water cooling was performed to obtain a laminated plate.

The surface scratch hardness and cigarette resistance of the above laminated plate were measured, and the results are shown in Table 1.

Surface scratch hardness: 10-point average value by JAS standard A test, depth (μ).

Cigarette resistance: Observation of the surface condition after leaving a lit cigarette for 2 minutes and wiping it with methanol.

Evaluation (Average of 2 points) ○ Almost no discoloration × Coloring due to burning In Comparative Example 2, the resin compositions were not mixed and molding was not possible. Comparative Example 3 is an example in which another type of polyacrylate different from the poly (meth) acrylate used in the present invention was used.

Claims (1)

[Claims] 1. A surface layer obtained by impregnating a thermosetting resin composition (I) below onto a substrate for impregnation selected from a printing paper, a woven fabric and a non-woven fabric, and a plywood, a particle board, and a resin. A laminated plate in which the kraft paper and the substrate selected from the metal plates are laminated and integrated. (I) Polyallyl pentaerythritol having three or more acryloyl groups or methacryloyl groups in the molecule based on 100 parts by weight of a diallyl phthalate resin or a mixed resin of at least 20% by weight of a diallyl phthalate resin and an unsaturated polyester resin. A thermosetting resin composition comprising 5 to 70 parts by weight of an acrylate or polymethacrylate or a mixture thereof and a curing agent for the above resin.